/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;

public class ProxyDrawable extends Drawable {

	private Drawable mProxy;
	private boolean mMutated;

	public ProxyDrawable(Drawable target) {
		mProxy = target;
	}

	public Drawable getProxy() {
		return mProxy;
	}

	public void setProxy(Drawable proxy) {
		if (proxy != this) {
			mProxy = proxy;
		}
	}

	@Override
	public void draw(Canvas canvas) {
		if (mProxy != null) {
			mProxy.draw(canvas);
		}
	}

	@Override
	public int getIntrinsicWidth() {
		return mProxy != null ? mProxy.getIntrinsicWidth() : -1;
	}

	@Override
	public int getIntrinsicHeight() {
		return mProxy != null ? mProxy.getIntrinsicHeight() : -1;
	}

	@Override
	public int getOpacity() {
		return mProxy != null ? mProxy.getOpacity() : PixelFormat.TRANSPARENT;
	}

	@Override
	public void setFilterBitmap(boolean filter) {
		if (mProxy != null) {
			mProxy.setFilterBitmap(filter);
		}
	}

	@Override
	public void setDither(boolean dither) {
		if (mProxy != null) {
			mProxy.setDither(dither);
		}
	}

	@Override
	public void setColorFilter(ColorFilter colorFilter) {
		if (mProxy != null) {
			mProxy.setColorFilter(colorFilter);
		}
	}

	@Override
	public void setAlpha(int alpha) {
		if (mProxy != null) {
			mProxy.setAlpha(alpha);
		}
	}

	@Override
	public Drawable mutate() {
		if (mProxy != null && !mMutated && super.mutate() == this) {
			mProxy.mutate();
			mMutated = true;
		}
		return this;
	}
}
